Published in Health Risk Factor Week, May 5th, 2009
Ricin, a protein extracted from castor beans, can be in the form of a powder, mist, pellet or solution. When injected or inhaled, as little as one-half milligram of ricin is lethal to humans. No antidote is available. The most infamous ricin attack occurred in London in 1978, when Bulgarian dissident Georgi Markov died...
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